Shuttle for automatic looms



Nov. 29, 1938. R. G. TURNER SHUTTLE FOR AUTOMATIC LOOMS I Filed Jan. 2, 1937 Inventor Richard flrTurner 44m? Attorney momentum of the bobbin when the shuttle is With these and other objects in view which .5 boxed. will appear as the description proceeds, my in- When bobbins oval in transverse ection are vention resides in the combination and arrangeused it is necessary to maintain the long transment of parts hereinafter described and set forth. verse axis horizontal. If this axis becomes ver- In the accompanying drawing, wherein a contical the lower edge of the weft projects below Vehieht embodiment of y invention is Set forth, to the bottom of the shuttle and interferes not only Fi 1 i a p p v w of one n of a y with correct shuttle boxing, but also interferes Showing a Shuttle made ccording to my Dreseh with the lower sheet of warp threads during. the invention, flight of the shuttle. Fig. 2 is a. vertical section on an enlarged scale It has been discovered that there is a tendency On line is on the part of a bobbin to rotate about its longi- F g. 3 is a diagrammatic v w ill r i g the tudinal axis during weaving, particularly when a s e mechanism, and bobbin is held by means of spring jaws which en- 4 is a horizontal Sect o n ne of gage rings on the head of the bobbin. An angular motion sufiicient to give the bobbin a quarter turn Referring mo e p a ly to Fi I ve would place the long transverse axis vertical and shown a 100m y having a Shuttle bOX B to .20

Patented Nov. 29, 1938 2,138,221

UNITED STATES PATENT OFFICE SHUTTLE FOR AUTOMATIC LOOMS Richard G. Turner, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application January 2, 1937, Serial No. 118,787

4 Claims. (Cl. 139207) This invention relates to improvements in autothe shuttle when the latter is being boxed and matlc looms and more-particularly for means for therefore eliminate possibility of the bobbin turnpreventing spring clips from spreading due to ing on its axis.

interfere very objectionably with the proper pickreceive a shuttle S provided with a bobbin H. ing of the shuttle and result also in damage to The bobbin y be f the sooa11ed oval or t the lower part of the mass of eft, type wherein the barrel on which the weft W is The shuttle moves at a high rate of s ed and wound has a horizontal transverse dimension 5 is brought to r st abru tl by engagement th greater than the vertical dimension and the weft the picker. This stopping or" the shuttle motakes the gener-alformihdioated in F tion is attended with considerable shock and as a The bobbin has a head E15 prdvided'with e result there is a tendency on the t of th customary metal rings [6 which are received by a bobbin to continue movement in the direction of Spring p IT having front a real laws l8 and 39 travel of the shuttle due to its momentum. Berespectively These l w a ved in th cause of the shape of the contacting surfaces usual manner, a Suggested in go ceive between the rings and the spring jaws the latter the rings The rings d t e W den head spread slightly due to the fact that the bobbin f the b bbin n whi h 'ar t d e her tends to continue its motion when the shuttle is th t e Spring D n are of the usual Construcabruptly stopped. When the momentum of th tion. The box B has a shuttle binder 28 and a v bobbin is spent the jaws move back to their norbinder Spring 21 and the Shuttle p p y mal position. If at this time the spring forces a picker 22 in the usual way.

acting on the bobbin are not balanced there will When the shuttle is boxed it strikes the picker be a slight turning moment tending to rotate the 22 with considerable force and is brought to rest 40 bobbin about its longitudinal axis. abruptly, since the picker lies against the box 40 It is an important object of my present inend 23. As a result the bobbin, because of its vention to prevent the aforesaid slight spreading momentum, tends to move toward the picker and of the jaws when the shuttle is boxed. As set the round rings bearing against the bevels 25 forth hereinafter I accomplish this result by proof the sides of the grooves 26 tend by reason of 5 viding the shuttle with resilient blocks or" rubber the force exerted due to momentum to spread or the like which are sufficiently strong to rethe jaws slightly. This force is not very large sist spreading of the jaws by any force which but is suflicient to cause a temporary separation may be exerted by the rings of the shuttle against of the jaws l8 and I9. the bevelled grooves of the jaws incident to box- The matter thus far described is of known ing. The blocks, however, are suihciently reconstruction and of itself forms no part of my 50 silient to yield under the positive force exerted present invention. by the transferrer at the time a new bobbin is In carrying my invention into effect, I probeing inserted into the shuttle. By provision of vide the shuttle with blocks 30 of slightly resilient these means I maintain close contact between rubber which are interposed between the front the rings of the bobbin and the spring jaws of and back shuttle walls 3| and 32, respectively, 55

as shown, and the jaws I8 and I9, respectively. These blocks may be recessed into the shuttle walls or held therein in any other approved manner. The blocks 30 bear against the outer vertical walls of the adjacent jaws and create sufficient resistance to prevent spreading of the shuttle by momentum of the bobbin when the shuttle is boxed.

It is necessary to make provision for transferring a new bobbin into the shuttle, and this result may be accomplished as shown in Fig. 3 by a transferrer arm 40 movable about a pivot 4| and is actuated by a latch 42 pivoted to the arm at 43 and movable by mechanism not shown but well understood into the path of the dagger 44 on the lay. A reserve bobbin 5!] is presented in any approved manner under the transferrer arm when a transfer is to take place. The advancing lay depresses the rear end of the transferrer arm to force the reserve bobbin 50 against the bobbin lever. At this time the blocks 30 will not be able to prevent spreading of the spring jaws under the action of the positive force exerted by the transferrer arm, and the reserve bobbin 50 will therefore pass into the shuttle and the depleted bobbin I I will be expelled downwardly through a slot Si in the lay. As soon as the transferring action is completed the blocks 30 will spring back to their normal condition where they are effective to resist a separation of the jaws when the shuttle is boxed.

It is to be understood that my present invention contemplates a particular relationship between three forces the strongest of which is exerted by the transferrer arm through the incoming bobbin and the weakest of which is exerted by the momentum of the bobbin tending to spread the jaws when the shuttle is boxed. Lying intermediate these two forces is the resistance offered by the blocks 30, these blocks being strong enough to resist compression when the shuttle is boxed, but yielding sufficiently to permit a normal transfer when the transfer arm 40 descends.

From the foregoing it will be seen that I have provided a shuttle wherein the spring jaws are prevented from separation by engagement with the slightly resilient means interposed between the jaws and the walls of the shuttle when the shuttle is boxed. It will also be seen that the resistance offered by these resilient means represents a force which lies between that exerted by the transferrer arm and the force of the momentum derived from the bobbin when the shuttle is boxed.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a shuttle for an automatic loom, integral spaced resilient bobbin holding jaws mounted in the shuttle, a bobbin having rings held by the jaws and tending by the momentum thereof to spread the jaws apart when the shuttle is boxed, and a block of slightly resilient material for each jaw, each block located between and contacting the corresponding jaw and an adjacent part of the shuttle adjacent to the rings, said blocks resisting the tendency of the jaws to spread apart when the shuttle is boxed.

2. In a shuttle for an automatic loom, integral spaced resilient bobbin holding jaws mounted in the shuttle, a bobbin head with rings held by the jaws and tending by the momentum thereof to spread the jaws apart when the shuttle is boxed, and a block of slightly resilient rubber for each jaw, each block of rubber engaging the shuttle and also the corresponding jaw adjacent to the rings on the head, said blocks resisting the tendency of the jaws to spread apart when the shuttle is boxed.

3. In a shuttle for an automatic loom, a pair of integral resilient substantially parallel jaws mounted in the shuttle and extending along walls of the shuttle and having grooves therein, a bobbin having a head provided with rings to enter the grooves of the jaws, said bobbin tending by its momentum to spread the jaws apart when the shuttle is brought to rest, and a block of resilient material between each jaw and the adjacent shuttle wall acting in addition to the resilience of the jaws to prevent separation of the latter by the momentum of the bobbin, said blocks being located between the grooves in the jaws and the adjacent shuttle walls.

4. In a shuttle having spaced vertical walls, a spring member mounted in the shuttle and having two spaced resilient integral jaws, each jaw extending along one of the walls, each jaw having transverse grooves therein on the sides thereof opposite the adjacent wall, a bobbin having a head provided with holding rings which enter the grooves in the jaws, the momentum of the bobbin tending by reason of contact between the rings and the jaws to spread the latter when the shuttle is brought to rest, and a block of rubber between each jaw and the adjacent shuttle wall, each block of rubber engaging the corresponding jaw along the surface opposite the grooves there of and acting in addition to the resilience of the jaws to resist spreading of the latter by the bobbin when the shuttle comes to rest.

RICHARD G. TURNER. 

